Locomotive



July ze, 1927.

N. T. McKEE LocoMo'rIvE Filved Feb. 14. 1925A l N V EN TOR.

A TTORNE Y.

Patented July 26, 1927.

unirse sTATEs NEAL TfMoKEE, OF'BRONXVILLE, NEW YORK.

LOCOMO'IIVE.

Application tiled February My invention relates to exhaust pipes for locomotives and has particular reference to the disposition of the auxiliary blowerl nozzle with respect to the main exhaust pipe.

ln the ordinary form of locomotive, the draft necessary to support the high combustionA rates which are employed is obtained by discharging the exhaust steam from the main engine cylinders through a nozzle located directly `beneath the smoke stack, in the smoke-box portion of the boiler. 'lhe necessary artificiall draft can, however, be obtained from this source only when the engine is in operation, and in order to produce a draft when the locomotive is standing idle or is drifting, an auxiliary steam jet v operated by live steam is usually provided, for use when 'exhaust steam is not available. 'lhis auxiliary jet or blower is placed beneath the smoke stack and may be either' closelyfadjacent to or within the main exhaust pipe.

During periods when the main engine. is in operation the exhaust steam therefrom creates a pressure within the exhaust pipe above that existing in the smoke-box, but during periods when the engine is not in operation and there is no pressure within the exhaust pipe, ashes, soot and other solid matter contained in the combustion gases in the smoke-box are free to enter the exhaust pipe. When the locomotive is standing idle this foreign matter may enter the exhaust pipe by gravity alone, and this condition is greatly aggravated when the locomotive is drifting or coming to a` stop with the throttle closed. In the latter case the continued reciprocation of the engine pistous creates a partial vacuum in the exhaust passages and pipe, which draws a considerable quantity of foreign matterY of an abrasive nature from the smoke-box through the exhaust passages into the valve chests and cylinders of the engine. This results in scoring of the cylinder' and valve chest walls and other serious damage.

lu order to obviate the damage resulting from this reversal of flow through the exhaust passages l provide auxiliary jets or blowers which in addition to creating the necessary draft when the engine is shut oft' will also create during these periods a positive steam pressure within the exhaust pipe and thereby prevent flow vreversal therethrough.

14, 1925. seri-a1 No. 9,337.

lin the accompanying drawings l have shown two forms of my invention as applied to the conventional form of locomotive smoke-box; Figure l beinga somewhat diagrammatic view in elevation of the front end of a locomotive with the smoke-box front removed, a portion of the ligure being broxen away to show a section through the exhaust pipe, and Figure 2 being a section lalien on the line 2 2 of Figure l. Figure l is a fragmentary section of a view similar to Figure l, showing a slightly modified torni ofblower. r

Referring to Figure l, the cylinder' l, valve chestz, and exhaust passages 3, are incorporated in the usual saddle casting t. The exhaust passages 3 terminate closely adyacent each other inthe bottom of theVsmoke-box 'the exhaust pipe 6 is suitably mountries at its upper end the jet forming nozlzle 7, which should be directly beneath the extension S ofthe smoke stack. In order to bring the tip of the nozzle directly beneath the smoke stack it is sometimesnecessary to offset the nozzle casting 6 longitudinally ofthe smoke-.box and when this is done a detlecting web 9 is provided within the exhaust pipe casting 6 lto direct the exhaust steam in a line parallel with 'the axis of the pipe.

According to this embodiment of myfinvention, the lower portion of the trans-v verse web 9 is cored out to provide a'narrow passage l0, which communicates with they longitudinal passage ll pro-vided in the central upper portion of the web 9, the passage ll carrying the jet forming tip l2 at its upp lrend. lt isof course to be understood that the upwardly directed jet may issue directly from the passage ll and the web 9 maybe omitted in cases where the exhaust pipe (3 is vertical, although the webl may be useful in any case as asupport for the passage ll; In the bottom of the passage l() there are' provided smallv ports 13. which serve to place this passage in direct communition with the main exhaust passages 3.

fljipes la connect the passage l0 with the steam space of the boiler, there being a valve (not shown) located in the steam line, which is manually controllable from the locomotive cab, in order that the auxiliary or blower jet l2 may be operated as desired when the main throttle is closed, and shut lll) ww. a

oil when the main engine provides the necessary exhaust steam. If desired, the operation of the lblower may be made autoinatic by lnown means lorn'iing no part of the present invention. Y

It is particularly to be noted that in my invention the blower tip l2 is placedwell below the discharge end ol the main exhaust nozzle 7 and in such r tion thereto thatl when the blower nozzle is in operation the expanding jet of steam issuing therefrom completely lills the uppei` portion of the main exhaust pipe, issuing i'rom the latter in the form ola'jet which con'ipletely lills the e ring in the ynozzle,

' -his auxiliary jet aided by the jets' issuing from the openings or ports 13 creates a p 'essere in the exhaust passages and the in exhaust nozzle which prevents the entrance of combustion gases and foreign matter such as ash, cinders, etc., .into these pasn sages under the influence of suction created in the main engine cylinders by the idly moving pistons. y

lt will be apparent that the number and exact disposition oi' the openings 13 will be subject to considerable variation with difn ferent engine designs, and in Fig. 3 l have shown a variation in which additional. ports 13 are disposed both at the top and sides of the'transverse passage l0 as well as at the bottoin thereof;

The invent-ion accomplishes the desired re- Sult by arranging the lopenings from the blower apparatus as al whole softhat when the blowerv is in operation steam under a positive pressure is admitted to the exhaust passages, valve chests and cylinders of the engine, thereby substantially eliminating the suction normally produced by the engine pis tons and preventing the possibility of im? purities being drawn through the upwardly directed blower Jet which, simultaneously Vith the creation of a pressure within the `exhaust passages and pipe, lills the exhaust nozzle with an upwardly directed jet of steam.

vWhat I claim is: Y

l. In a locomotive sinolrebox, the combination, with exhaust steam passages terminate` ing in a main'exhaust pipe; of auxiliary -draft creating means located within said i e and means for sun nl ino' steam to said P P a i s draft creating means, said first named means having discharge openings therein so located that when steam is supplied thereto a por- 'Vprising an upwardly directed `discharge tip terminatingbelow the upper end oi' said. exhaust pipe and a plurality ol discharge openings located below said upwardly directedV tin.

3A lira locomotive smoltebox', the combination, with a main exhaust pipe; ola blower pipe located therein, said blower pipe coniprising an upwardly directed discharge tip terminating below the upper .end of said exhaust pipe andl a downwardly 4directed discharge opening` located below said upwardly directed tip.

4l. In a locomotive'sinokebox, the lcombination et an exhaust pipe, `a transverse/passage extending through said pipe, alongitudinal passage located within said' l3ij e-eoirriniifni eating at one end with said` transverse passage and terminating in a discharge tip at its. other end, sai-d tip being below the upper end oi said exhaust pipe,anda plurality of discharge openings inl said transverse pas- 5. ln a locomotive smoleboxthecombi-na- Y vtion oi" an exhaust pipe, a trzrnsverse passage said exhaust pipe, said blower pipe located below the upper end of said exhaust y pipe anda plurality of downwardly directed openings adapted toV dischargeinto said exhaust passages.

'l'. In a locomotive smoke-box, the combination with a main exhaustpipe, of a'bl'owerV pipe located therein, saidrblower. pipe coinpris-ing an. upwardly directeddischarge tip terminating below the upper-end oi' said exhaust pipe, and discharge opening located below said upwardly directed tip.

NEAL T. MORE-E.

llO 

